Though I'm not ubutu user, but I do have the same problem while upgrading vanilla kernel from 2.6.17.4 to 2.6.22.15. Therefore it should not be the ubutu specific problem. Here is bonnie++ test result on old and new kernel respectively. The disk throughput is improved 10% but CPU utilization shoot up to 95% from 34%, for the same amount of I/O. Could someone help to point to any patches, or fixes on this issue?
## ###############Linux 2.6.17 #1 SMP Tue May 6
##################################
Though I'm not ubutu user, but I do have the same problem while upgrading vanilla kernel from 2.6.17.4 to 2.6.22.15. Therefore it should not be the ubutu specific problem. Here is bonnie++ test result on old and new kernel respectively. The disk throughput is improved 10% but CPU utilization shoot up to 95% from 34%, for the same amount of I/O. Could someone help to point to any patches, or fixes on this issue?
## ####### ####### #Linux 2.6.17 #1 SMP Tue May 6 ####### ####### ####### ######
#######
Version 1.03c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
-- ----Sequential Create------ --------Random Create--------
-Create- - --Read--- -Delete-- -Create-- --Read--- -Delete-- 68-2.infoblox. com,2016M, 23989,35, 44123,6, 16360,1, 21823,28, 43090,1, 172.7,0, 16,++++ +,+++,+ ++++,++ +,+++++ ,+++,++ +++,+++ ,+++++, +++,+++ ++,+++
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP
K/sec %CP /sec %CP
ib-10-34-68-2 2016M 23989 35 44123 6 16360 1 21823 28 43090 1 172.7 0
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
ib-10-34-
## ####### ####### #Linux 2.6.22.15 #1 SMP Tue May 6 ####### ####### ####### ######
#######
bonnie++ -d /storage -s 2016M -u root
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
-- ----Sequential Create------ --------Random Create--------
-Create- - --Read--- -Delete-- -Create-- --Read--- -Delete-- 68-2.infoblox. com,2016M, 26078,94, 52117,17, 23596,5, 27172,86, 56402,4, 160.2,0, 16,++++ +,+++,+ ++++,++ +,+++++ ,+++,++ +++,+++ ,+++++, +++,+++ ++,+++ ####### ####### ####### ####### ####### ####### ####### ####### ####### ####### ######
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP
K/sec %CP /sec %CP
ib-10-34-68-2 2016M 26078 94 52117 17 23596 5 27172 86 56402 4 160.2 0
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
ib-10-34-
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